[R-sig-Geo] Lightning density map

[Robert J. Hijmans]

library(raster)
?rasterize


On Fri, Feb 15, 2013 at 7:56 AM, Bogdan Antonescu
<bogdan.antonescu at manchester.ac.uk> wrote:
> Hi ,
>
> I am trying to plot a cloud-to-ground lightning density map for Romania. The
> data set contains: date(year/month/dat), time(hh/mm/ss), latitude, and
> longitude for each lightning flash. The density maps were based on dividing
> the study area into a grid cells (e.g., 20-km to correspond with the audible
> range of thunder). I have used ArcGIS to calculate a density value for each
> cell by counting the number of lightning flashes within the cell and
> dividing by the cell area. The density value (flashes km-2) is then assigned
> to each cell.
>
> Can someone help me on how to do this in R?
>
> Thank you very much,
>
> Bogdan
>
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